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According to the code-date stamp on the label, the CRT is from 1960. Sears Silvertone replacement CRT's were always sourced by Sylvania.
The original CRT was probably an RCA.
The original owner might've had a maintenance agreement from Sears. That would explain all the Silvertone branded tubes.
It seems, RCA made all the 21AX CRT's. Sylvania might've just regunned them or if it was a new tube, Sylvania bought it from RCA and relabeled it.
04-25-2016, 09:04 AM
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